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URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
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Resultados da Pesquisa
Item Multiple-trait model by Bayesian inference applied to environment efficient Coffea arabica with low-nitrogen nutrient(Instituto Agronômico (IAC), 2023-04-14) Silva Júnior, Antônio Carlos da; Moura, Waldênia de Melo; Torres, Lívia Gomes; Santos, Iara Gonçalves dos; Silva, Michele Jorge da; Azevedo, Camila Ferreira; Cruz, Cosme DamiãoIdentifying Coffea arabica cultivars that are more efficient in the use of nitrogen is an important strategy and a necessity in the context of environmental and economic impacts attributed to excessive nitrogen fertilization. Although Coffea arabica breeding data have a multi-trait structure, they are often analyzed under a single trait structure. Thus, the objectives of this study were to use a Bayesian multitrait model, to estimate heritability in the broad sense, and to select arabica coffee cultivars with better genetic potential (desirable agronomic traits) in nitrogen-restricted cultivation. The experiment was carried out in a greenhouse with 20 arabica coffee cultivars grown in a nutrient solution with low-nitrogen content (1.5 mM). The experimental design used was in randomized blocks with three replications. Six agromorphological traits of the arabica coffee breeding program and five nutritional efficiency indices were used. The Markov Chain Monte Carlo algorithm was used to estimate genetic parameters and genetic values. The agromorphological traits were considered highly heritable, with a credibility interval (95% probability): H2 = 0.9538 – 5.89E-01. The Bayesian multitrait model presents an adequate strategy for the genetic improvement of arabica coffee grown in low-nitrogen concentrations. Coffee arabica cultivars Icatu Precoce 3282, Icatu Vermelho IAC 4045, Acaiá Cerrado MG 1474, Tupi IAC 1669-33, Catucaí 785/15, Caturra Vermelho and Obatã IAC 1669/20 demonstrated greater potential for cultivation in low-nitrogen concentration.Item Selection of Conilon coffee clones for the Zona da Mata region of Minas Gerais, Brazil(Universidade Federal de Lavras, 2022-06-09) Moura, Waldênia de Melo; Pedrosa, Adriene Woods; Oliveira, Rebeca Lourenço de; Cecon, Paulo Roberto; Ferrão, Romário Gava; Ferrão, Maria Amélia Gava; Verdin Filho, Abraão CarlosRecently, the cultivation of Coffea canephora species has expanded as a consequence of climate change effects and emerging markets that use this cof-fee as raw material. To meet such demands of production, it is necessary to also improve yield in cultivated areas. Hence, this study aimed to evaluate Conilon coffee clones to identify the most promising fitting material for the Zona da Mata region of Minas Gerais, as well as to analyze the effect of the genotype x biennium interaction and estimate correlation coefficients among evaluated characteristics. Vegetative vigor, yield, main pests and diseases were evaluated in 36 clones from Incaper, ES. The statistical analyses considered the averages of each biennium: Biennium 1 (B1) - 2005/2006; Biennium 2 (B2) - 2007/2008; Biennium 3 (B3) - 2009/2010, and also the average of three biennia (A3B). Univariate and joint statistical analysis were performed, as well as estimates of phenotypic, genotypic and environmental correlation coefficients among assessed characteristics. A wide variability among clones was observed for most of the evaluated characteristics for both each biennium and the average of three biennia. The severities of most diseases have reduced over the years of cultivation. The genotypic correlation coefficients have overcome phenotypic and environmental ones. In general, pests and diseases severities showed significant and negative correlations with vegetative vigor and yield. On the other hand, the last two characteristics were posi-tively correlated. It was also evidenced a certain diversity among clones for most of the evaluated traits. Clone x biennium interaction was significant only for yield and leaf rust severity. There are negative correlations among the characteristics associated with yield and pests and diseases occurrences, which make it possible the use of yield variable as a selection parameter. Clones 24, 23, 28, 26, 21, 29 and 06 MG/ES present a higher potential for cultivation in the Zona da Mata of Minas Gerais.Item Adaptability and stability of organic-grown arabica coffee production using the modified centroid method(Crop Breeding and Applied Biotechnology, 2017-10) Moura, Waldênia de Melo; Oliveira, Ana Maria Cruz e; Gonçalves, Débora Ribeiro; Carvalho, Cássio Francisco Moreira de; Oliveira, Rebeca Lourenço de; Cruz, Cosme DamiãoThis study aimed to identify promising arabica coffee genotypes for organic systems. The experiments were arranged in a randomized block design, with 30 genotypes and three replications. The adaptability and stability analysis was carried out using the modified centroid method, considering the mean yield of two biennia (2005/2006 and 2006/2007, 2007/2008 and 2008/2009) in three municipalities (Araponga, Espera Feliz, and Tombos), totaling six environments. Significant genotype x environment interaction was observed for yield, and the municipality of Espera Feliz was the only favorable environment. Genotypes were classified into four of the seven groups proposed by the modified centroid method: maximum general adaptability (I), minimum adaptability (IV), mean general adaptability (V), and mean specific adaptability to favorable environments (VI). Cultivars IBC Palma 1, CatucaíAmarelo24/137, Sabiá 708, and H 518 are widely adapted, stable, productive and suitable for organic farming. Remove selectedItem Adaptabilidade e estabilidade de genótipos de café no cultivo orgânico em Minas Gerais(Universidade Federal de Santa Maria, 2014-11) Moura, Waldênia de Melo; Lima, Paulo César de; Lopes, Vanessa Schiavon; Carvalho, Cássio Francisco Moreira de; Cruz, Cosme Damião; Oliveira, Ana Maria Cruz eEste trabalho teve como objetivo comparar a adaptabilidade e estabilidade de cultivares de café quanto à média de produtividade anual e de biênios, pelo método de EBERHART & RUSSEL (1996), e selecionar cultivares de café para o cultivo orgânico em Minas Gerais. Os experimentos foram conduzidos em três locais, em delineamento de blocos casualizados com trinta genótipos e três repetições. Uma análise se baseou na produtividade média anual de quatro colheitas (2005/2006, 2006/2007, 2007/2008 e 2008/2009) com o total de doze ambientes. A outra análise considerou a média de dois biênios (2005/2006 e 2006/2007; 2007/2008 e 2008/2009) com o total de seis ambientes. A análise em que se considerou a média da produtividade do biênio apresentou redução expressiva do coefi ciente de variação ambiental. Por isso, foi possível identifi car mais cultivares com adaptabilidade e estabilidade para o cultivo orgânico. Conclui- se que a análise de adaptabilidade e estabilidade com base na produtividade de biênio é mais segura para a seleção de cultivares. Considerando essa premissa, as cultivares ‘Catucaí Vermelho 36/6’, ‘Catuaí Vermelho IAC 15’ e ‘Siriema 842’ são indicadas somente para os ambientes favoráveis. As cultivares ‘Sabiá 708’, ‘IBC Palma 1’, ‘Catucaí Amarelo 24/137’, ‘Oeiras MG 6851’ e as linhagens H518 e H514 são indicadas para o cultivo orgânico em locais com ambientes similares aos avaliados em Minas Gerais.Item Genetic diversity in arabica coffee grown in potassium-constrained environment(Editora UFLA, 2015-01) Moura, Waldênia de Melo; Soares, Yaska Janaína Bastos; Amaral Júnior, Antônio Teixeira do; Lima, Paulo César de; Martinez, Hermínia Emília Prieto; Gravina, Geraldo de AmaralPotassium is a source of non-renewable natural resource, and is used in large quantities in coffee fertilization through basically imported formulations in the form of potassium chloride. An alternative to make production systems more sustainable would be obtaining cultivars more efficient in the use of this nutrient. This study aimed to evaluate the genetic diversity among 20 cultivars of coffee, in conditions of low availability of potassium to identify the best combinations for composing future populations to be used in breeding programs. The experiment was arranged in a randomized block design with three replications of nutrient solution. Agronomic characteristics and efficiencies of rooting, absorption, translocation, biomass production and potassium utilization were evaluated. The clustering analysis was based on the unweighted pair group method with arithmetic mean clustering algorithm (UPGMA) and canonical variables. Variability was observed for most treatments. The multivariate procedures produced similar discrimination of genotypes, with the formation of five groups. Hybridizations between the cultivar Icatu Precoce IAC 3283 with cultivars Catuaí Amarelo IAC 62, Araponga MG1, Caturra Vermelho IAC 477, Catuaí Vermelho IAC 15, Rubi MG 1192 and Catucaí 785/15, and between the cultivar Tupi IAC 1669-33 with cultivars Icatu Vermelho IAC 4045, Acaiá Cerrado MG 1474 and Oeiras MG 6851 are the most promising for obtaining segregating populations or heterotic hybrids in breeding programs aiming more efficiency in potassium utilization.Item Desempenho de cultivares de café em sistema de moura, cultivo orgânico na zona da mata mineira(Editora UFLA, 2013-07) Moura, Waldênia de Melo; Lima, Paulo César de; Fazuoli, Luiz Carlos; Condé, Aurinelza Batista Teixeira; Silva, Tales CamposObjetivou-se,neste trabalho,avaliar o desempenho de cultivares de café em sistema de cultivo orgânico, visando a indicação de cultivares promissoras para a Zona da Mata Mineira. Os experimentos foram instalados no ano de 2003 e conduzidos até 2009, em delineamento de blocos casualizados com trinta genótipos (cultivares e linhagens) e três repetições, nos municípios de Araponga, Espera Feliz e Tombos, representativos dessa região. Foi utilizada a metodologia de pesquisa participativa e as avaliações iniciaram no ano de 2006, que perduraram por quatro colheitas. As cultivares apresentaram variabilidade para a maioria das características avaliadas. Em geral, foi constatada baixa incidência de pragas e doenças, decorrente de fatores genéticos e provável influência das adubações orgânicas e do controle natural. O vigor vegetativo, a produtividade, a severidade de ferrugem e de cercosporiose apresentaram interação genótipos x locais significativos. Foram identificadas as cultivares de café promissoras para cada local em estudo, incluindo as resistentes, de moderada resistência e suscetíveis à ferrugem. As cultivares Sabiá 708, Catucaí Amarelo 24/137, IBC Palma 1, Paraíso MG H 419-1, Catucaí Vermelho 36/6, Catuaí Vermelho IAC 15, Oeiras MG 6851 e a linhagem H518 são as mais indicadas para o sistema de cultivo orgânico na Zona da Mata Mineira.